A vintage transformer with wires at the secondary side. A green and yellow ground cable goes to the bottom of the case.

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   root42 (root42@chaos.social)'s status on Sunday, 26-May-2024 01:50:31 JST root42

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   Next step is now to reactivate the power supply. I removed the mains filter and rewired all the connections using fresh solder and WAGO clips. I also cleaned the power cord. Afterwards I tested that GND is connected to all metal parts of the case, N and L have good continuity and low resistance and that the power switch works and properly opens and closes. I think this should be safe to turn on!